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Organization and Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Restricted cash | $ 70,261 | $ 40,272 |
Retained earnings | 286,623 | 256,301 |
Distributions received from joint ventures | 5,730 | 1,880 | $ 1,167
Impact from adoption of ASU 2018-02 | 59 |  |
ASU 2016-15 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Distributions received from joint ventures |  | (1,900) | (1,200)
Distributions received from joint ventures |  | 1,900 | $ 1,200
ASU 2018-15 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Capitalized costs | 900 | $ 0 |
ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | 1,300 |  |
ASU 2016-02 | Minimum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating liabilities | 4,000 |  |
ROU assets | 4,000 |  |
ASU 2016-02 | Maximum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating liabilities | 5,000 |  |
ROU assets | $ 5,000 |  |

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